Piper SEMINOLE PA-44-180, Maintenance Manual

Page: 401 / 881

INSTALLATION OF DEICER AND REQUIRED MATERIALS.
It is imperative that the following instructions be followed exactly to insure maximum adhesion to the
propeller blades:
1. When the cement coats are tacky (slightly sticky to the touch-like masking tape), dry on both the propeller
surface and deicer surface, position deicer on blade leading edge. Start at hub end, using centerlines as a
guide. (Refer to Figure 30-11)
2. Make sure that the harness will fall in the previously marked position.
3. Working outward toward the tip, tack the deicer centerline to the leading edge of the propeller blade.
4. Use the tackifying solvent as necessary. If deicer is allowed to get off course, pull up with a quick motion
and re-apply deicer.
5. If cement is removed from either surface, completely remove the deicer and re-apply cement as explained in
the previous paragraph.
6. When the deicer is correctly positioned, roll firmly along the centerline with a rubber roller. (Refer to
Figure 30-10.)
7. Gradually tilt the rubber roller and carefully work the deicer over either side of the blade contour to avoid
trapping air. Roll outwardly from centerline to edges. Be especially careful to work out excess material at
outboard edge of deicer before other edges are completely rolled down. If excess material at edges tends to
pucker, work out puckers smoothly and carefully with fingers.
8. Roll the tapered edges, especially inboard edge of the deicer with the metal stitcher.
— CAUTION —
TO AVOID DAMAGE TO DEICER RESISTANCE WIRES, DO NOT USE
M E TAL STITCHER ON BODY OF DEICER. AREA WHERE META L
STITCHER IS PERMITTED NOT TO EXCEED 3/16” ALONG DEICER
EDGE.
PREPARATION AND APPLICATION OF SEALER.
Deicers loosened due to destruction of adhesive bond by lubricants do not respond well to recementing.
Therefore, removal, cleaning, and reinstallation of the deicers are recommended.
1. Clean an area .500 of an inch wide around the circumference of the deicer down to the bare metal. Use
MEK or Acetone and clean thoroughly.
2. Clean outer . 500 of an inch of all deicer edges and back under deicer about .250 of an inch on all sides past
loosened areas with MEK or Acetone. For final cleaning, quickly wipe off solvent with a clean, dry lint free
cloth to avoid leaving a film.
3. Recement loosened areas of deicers in accordance with the paragraph on cement application.
4. Mix the filler, sealer, or paint thoroughly and in the proper proportions by weight, as given in Chart 3006.
5. Locate masking tape approximately .125 of an inch beyond the cemented area around the deicer to permit
filler material to contact bare metal.
6. Apply one even coat of filler to area around the inboard end and sides of the deicer. (Refer to Figure 3-11)
Immediately remove the masking tape and allow the filler to dry for six hours.
7. Apply masking tape about .125 of an inch beyond filler or .250 of an inch beyond cemented area when no
filler is used, to permit sealer to contact bare metal. Apply one even brush coat of sealer to the area a-round
the deicer. (Refer to Figure 30-11) Remove masking tape immediately and allow sealer to dry. Allow 12
hours cement curing time before starting engine, allow 24 hours cement curing time before operating the
deicers.
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
3 0 - 6 8 - 0 8
Page 30-41
Revised: May 15, 1989
2E21
PIPER AIRCRAFT